Sheet feeding and positioning mechanism



April r.1 7, 1951 J. DE LAA FUENTE TEJEDO Y SHEET FEEDING AND POSITIONING MECHANISM 2 sheets-sheet 1 Filed Feb. 11, 194e mventor Il... Xl.

JUAN DE LA FUENTE TEJEDO,

(ttorneg April 17, 1951 J. DE A FUENTE TEJEDO 2,549,293

- SHEET FEEDING AND POSITIONING MECHANISM Filed Feb. l1, 1948 2 Sheets-Sheetf Srmentor JUAN DE LA FUENTE TEJEDO,

Gttorneg Patented Apr. 17, `1951 SHEET FEEDING AND PosITIoNING MnoHANIsM Juan dela Fuente Tejedo, Madrid, Spain Griginal application February 19, 1945, Serial No.

ary 15, 1944 3V Claims. (Cl. 197-127) This application is a division of my application entitled Electric Machine for Typing in the Braille and Abreu Systems, Serial No. 578,653. filedFebruary 19, 1945, novv Patent No. 2,454,637 dated. November 3, 1948. l f

-This inventionrelates to sheet feeding and positioning mechanism as used in electrically operated typewriting machines for embossing paper I according to the Braille and Abreu code systems devised for use by the blind.

Machines of this type have been known com-v mercially for many'years, as instanced by the Llorens, Braille, Abreuand other makes.

Such machines generally included a groupof embossing rods operated singly or in various combinations by depressib'le keys.`

The Braille system employs a six-point code, that is, a group of six paper-indenting rods is arranged beneath the paper, and in line with an anvil overhanging theendsof the indenting rods. The paper advancesbetween. the freeends of the indenting rods and the anvil. i

y Depression of the appropriate keys projects the lfree ends of the indenting rods against the paper, forcing the latter against the anvil or platen. The anvil may be provided WitnaY series of recesses in register with the free ends of the respective indentingv rods,- and the impact of the selected rods against the paper forces the latter against the anvil, the free endsoiC the rods pressing the paper into the correspondingv recessesin the anvil to indent the paper with. a code` representation of a particular letter, numeral .or symbol.

In those typewriting machinesemploying a sixpoint-code, thekeyboardlmay have hut-six-keys,

each of which is indi-vidualto-its respective indenting rod, in which event, combinations of keys must be depressed in the majority of instances,

Where the code representation of a letter, nu-

of the indenting-rods, itvbeing obvious that with the employment of asiX-point code, certain of the keys must actuate at least five' indenting rods,

and one key may have to operate all six indenting rods, depending upon the-number of different code representations to berformed.;

- This requires'the-operator. tot exercise more pressure on someef tliekeysthan ern-those which Divided and this application February 11, 1948, Serial No. 7,693.

In Spain Janu- 2 are required to operate but a single identing rod only. This induces uneven fingering of the keys and leads to mistakes, particularly disadvantageous in this type of machine wherein the erasure of improper representations is difcult, if not impossible, and entails more care on the part of the operator. Y

To remedy this unevenness of touch, these machines have heretoforevbeen provided with electrically operated power devices, as, electromagnets of dilerent types individual to their respective indenting rods, for projecting the rods, the keys upon depressionmerely serving to close one or more circuits arranged in proper combinations with the'fseveral electrically operated povver de vices.

These attempts have not avoided the unevenness of touch, however, since the circuit combinations are closed by rocking single spring-restored levers in some instances, by the pressure exerted upon the selected key, whereas, in the majority of instances, the selected key must rock two, three, four, ve and possibly six spring-restored levers to form the desired code representations. Y

Therefore, one objectV of this invention is to provide, in a typewriting machine having electrically operated means to indent paper in accordance with a legible code, a keyboard, the keys of Which may be depressed by an even equal pressure, to select any one or more of the individually operable indenting means -for operating in forming the code representations corresponding with the letters of the alphabet, numerals and punctuation marks;

In attaining this object, the structures of the prior art have been greatly simplified by eliminating the systems of levers heretofore selectively operated singly or in various groups by the manually depressedkeys,I and instead, the letter, numeral and symbol keys of the keyboard operate traveling contacts' which serve to close the various combinations of circuits required in theselection for operation of the proper combinations of indentingl rods to form code representations corresponding with the letters, numerals and symbols appurtenant to the particular keys depressed.

In designing machines for use by the blind in typing Braille code, it is highly desirable that tactile-sensible means be provided for use in the event that it becomes necessary for the operator to` remove a partially-coded sheet from the typethe machine in such exact adjustment thatthe writing may be re-commenced at the point where it ceased prior to the removal of the sheet.

Another object of this invention is the provision of novel and simplied means readily operable to accomplish this result.

A further very desirable feature for incorporation in typewriting machines for use by the blind is the provision of means, including a tactilesensible mark, or marks, which will enable the operator, when preparing to write on the back of a sheet already indented on its face, to correctly introduce and position the sheet in the machine in such manner that the indented code lines to be impressed on the back or rear face of the sheet shall be staggered, offset or interspersed relatively to the indented lines previously formed on the face of the sheet.

Therefore, still another object of this invention is the provision of novel and extremely simple marking means used in combination with the last-mentioned means which enables the correct re-insertion of a partially written sheet, the novel marking means enabling the operator through his sense of touch to position the sheet, already indented on its face, in such manner that the lines of indentati-ons to be impressed on the back of the sheet shall be interprinted or interspersed relatively to the lines of indentations on the face of the sheet.

Other objects and advantages will be more fully explained in the following specification and particularly pointed out in the claims.

Because the above improvements are applicable to Braille code typewriting or indenting machines old and well known in the art, it has seemed unnecessary to set forth in detail any but the main features of the old machines with which the novel mechanisms have been combined, to enable a proper understanding of the invention and its location with respect/to such old and well-known features.

Therefore,

Fig. l is a diagrammatic and conventionalized view in side elevation of the right side of any of the Well known forms of electrically operated Braille writing machines, equipped with the invntion;

Fig. 2 is a detailed View showing one of the writing keys of a full keyboard writing machine with a conventional disclosure of the circuits for energizing two electro-magnets controlled by the particular key;

Fig. 3 is a detail top plan view of the pressure roll mechanisms, and

Fig. 4 is a detail view in side elevation of the pressure roll mechanism.

Since the invention is intended for application to any of the well known embossing machines equipped with electrically operated embossing mechanisms, for use by the blind, the several novel features have been shown as applied to a conventional diagrammatic view, and it is to be understood that such view may be considered as a disclosure of any of said machines, except for such elements as constitute the present invention.

` Therefore, referring to Fig. l, the machine includes a main frame I provided with rails I a to support a traveling carriage 2 for letter spacing travel and return.

A full capacity keyboard is provided comprising character keys I representing any one or more notational systems, as the English alphabet, the ten digits, and various punctuation marks, or the like.

A space bar 'III which, With the keys 1, controls any well known form of letter spacing mechanism, not shown, in use on machines of the kind mentioned, may be conveniently positioned at the extreme front end of the main frame and in a lower plane than the character keys, as is customary.

Because of the area required to represent the notational characters in tactile-sensed Braille or other code to facilitate such tactile sensing by the blind, machines for writing Braille and similar codes are preferably provided with letterspaced escapements arranged to space the code characters a greater distance apart than are legible typewritten characters.

For these reasons, also, the line spacing mechanisms of Braille and similar code-writing machines provide wider spacing between the lines.

The electrically-operated embossing mechanism shown in dotted lines in Fig. 1 and in full Y lines in Fig. 2 is merely a diagrammatic showing of the electro-responsive devices I0, the actuating levers I I, I I, for the group of individually operable embossing rods I Ia, IIa guided for vertical sliding movement in a turret I4 projecting upwardly from a table I3 mounted in the main frame of the machine near its rear end.

Embossing machines for writing'Braille characters employ a six-unit code, the impressions or indentations representing the Braille characters being formed by any, and in one instance all, of six embossing rods IIa (Figs. l and 2) arranged in two straight parallel lines of three indentations each, which lines may be vertical or horizontal in relation to the writing line.

The form illustrated in the accompanyingY drawings shows the horizontal parallel arrangement of the embossing rods, and hence the right side view of the machine. Fig. 1 shows the two spaced embossing rods at the right hand end of the double line of three rods each.

Likewise, Fig. 1 shows only the two right hand actuating levers II for said two right hand embossing rods I Ia and the two right hand electroresponsive devices, as the electro-magnets I0, it being understood that there are two additional pairs each of electro-magnets, actuating levers and embossing rods behind, that is, to the left of those indicated in Fig. 1.

Obviously, these elements could be arranged according to the more common form wherein the embossing rods lie in two parallel rows of three units each to form code characters vertically in relation to the writing line.

Returning to the description of the machine as shown, the electro-magnets I0, I0 are suitably supported in the main frame I beneath a table I3.

The aligned pairs of oppositely extending actuating levers II, II, are pivotally supported intermediate their ends at IIb, IIb, by individual hangers IIc, IIc, depending in pairs from the under side of the table I3.

Armatures Illa, Illa, pivotally depend from the respective remote ends of the pairs of levers to overhang the cores of the electro-magnets, the proximate ends of the respective pairs of actuating levers being enlarged or lobed at IId, IId, to form peens which strike against the soles of olf-set or splayed feet IIe, IIe, fast on the lower ends of the vertical embossing rods IIa.

The pairs of feet are downwardly and outwardly inclined from theirpoints of attachment to the lower ends of their individual embossing rods IIa, to afford room between the bottom of 51 theetahle: wendithesunper Surfacesff.;theefeetr for. :thercompressed springs; fwhichfby 1er-ess against the feet., yieldingly: retainzthe fernbossing` rods I la in; their.: ioweredapdsitions.;

The, solesof they feet, in; turn,4 pressagainst the;

lobedA ends. lid; ofgtheir actuatingv leversfJi-fto;

rock the armaturesggla awayffrom thecorespf their corresponding.electrovmagnets G uidepins-1 'I-I project upwardly from` the -freefends or-toes; of;l the; splayedj feet' I le into; holes4 formed ink thef bottom; off` the-table.. I3.: to assstrin guiding:A ther embossingrods;I I Iga andltogholdthevfeet; in proper i position.

-Abutments 8.1V depending fromzzthefbottom; Off; theltable-v I 3j, limit `thezsprirlg-rac tuated-iintimement? ofythelevers-II.

The six-unit group of'embossingrods;project;4 vertically upwardthrough.,aperturesfinfthe table I3 :and thlQiig'h gudewaysginjthe vertically; pro. iectingturreuc-which guide: waysfrarezaligned with the apertures iny the tabla7 l The turret: projects; upwardly intov the space journaled. on the. rear-rends; of' rearwardlyl pro# jecting leaf springs Ila press the:y workpsheet.

against the respective knurled paper feed; rolls; I6.

The forward ends of theleaf springs..` Ila-:aref

adjusting meanszand-,thence out:rv of .tha-rear i of the paper carriage.

To enable the Work sheetto pass freely between the paper-and pressurerolls I6, I1, wheninsert-v ing and adjusting the sheet, a ,pressure roll ycastoif is provided, which, as shown, comprises a pressure rollA cast-off shaft 36- extending between and journaled inthe ends of the paper carriage 2, on which shaft are-'xed a plurality of cam members 81, one-cam member beneath and in line,V with itsA appropriate leaf spring arm Illa carrying a pressure feed roll I'i.`

In* their normal rest positions, these cast-01T or'pressure roll ,release cams 81 lie out of eiTec-.Y

carried by a cross rod 82 extendinglbetween, the j side framesv of the-,paper carriage.'-

Conveniently; thepaperifeedrolls Iflie adja-` cent to,:an`d= directly'in frontoffthe upper end` of the embossing rod turret.. I4',` as. shown in Fig: l. An anvilAa dependsfroma rearwardly:extendingy curved horn` 4` whichl suspends :the anvil directly: over the.y upper end of the turret Man-d spaced slightly apartgtherefrompto affordpassage for-:thel record sheet.. Customaril'y the Ilower free endfiot;V theanvil is provided withzaseries of recessesieach of which is in lineY with its kcorrespondingfeme.,v

bossingarodi II a; Thefforwardfend of lthe; cmryed anvil: vsupporting horn 41 is.i rmly securedf-tothe1- main: frame, .of`A they machine` fjustimrearLof the Y keyboard; asiscustomary:` i

A' hollow cylindricalipaper;'holden orfpalen holding scroll, indicated by dottedl lines 8,3: in Fig.:

traveling carriage 2r., This paperz'holdenrnay bey of the form used in the Hammond Typewriting: machine', or may be likel that@.shown-,1inv U; S. patentto Kurowski: et aL, 15767,",24'7; June 24,: 1930; to whichreferenceis also made for an apr-.1. proximation of thezpaper `feed-roll mechanism; above, describedi,

i Ik The work orirecord 'sheet.84.may be rolledrinto'fv a-sloose coil andy insertedfendwise from-fonefend-L of the paper Vcarriage intothepaperholder, from` which the leading edge of thersheet'isledithroughi theypaper' throat 34 along. the paper-apronf between. the vpaper feed. rol-1s [Iii an-dipressuretfeed rolls. Ii'I., thence between the recessedflowerrfacel.

off-the vanvili 4ay and: the.` upper'` end.` of-ftheemi-,rv

bossing. rodrfturrei yI 4i to the sheet: aligning andf:

dei

zrcept for an aperture through which,thekeyY sternq projectsftoform; a stop; vagainst;which they-lippen; end of the plunger strikes to arrest the trai/:el of4 the key `at its.,` normal elevated position;Y ,The-i 7 lower endz of the plunger is'contactedby ,one end;

f 35:: Peripherally` knurled pressure feed; rollsLwIl ti-ve.;rel ation withy their spring leaf arms, but.

upon manipulating al pressure roll cast-off handled!! fast on a projeetingendof the releaseV shaft 86, the release cams 81 are forced against ytheleaf spring arms Ila from beneath torock the arms upwardly anc disengage all pressure;` rolls I'I fromthe co-acting paper feed r-olls .IE

to enable therecord sheet to passi-freely theref-l between. It,v willbe ,understoodV that the paper apron 85 is; aperturedA oreut;v away at the proper points to,

permit the operationiof the pressure roll cast-off cams Bland also teclear the work sheetfeed rolls 15 as shown in `dotted lines in Fig;-` l, and

i the upperend ofV the embossingrod turret. I4. v

The foregoing is,V in a general sense, 0ldin the. art-the mechanisms abovel describedv forming-a part; of the invention so faraskthey co-act therewithrimthe accomplishment.: off the novelresults:y

0f :the inrention-now turbe setpforth.

Referringto Fig: 2 ,;a;,c,Qnrentbykk the trailingends of fourconductors.

The notation-representing keys "I open ,ands close the-circuits according to a predetermined code, the code being-well known'in the art-andyhence, not; illustrated.

The;application ofy this codeto the notation,- or character keys 'I and the controls exercised by: vthe keys i `onfathe. circuits will be. f explained in connection withI the v key mechanism embodying one feature of this invent-ion;

Asv heretofore stated, oneobject of thisrinventieni isf the,fproyision--ofl a. lient; andi even. ker',

tonen..

Asronemeans toetredt thisres-,111thi eaehsker" The plunger 'lc is contained in a guidewhigm as' shown,- consists; of; 'ag noni-cylindrical; tubular housing-Sito prevent rotationv of the key relatively toits. housing,v it; beingunderstocd that theieais;

aseparatefhousing for each key.,

Thefupper end ofY eachlhousingvgis closed 'eX'.-z`

of a coiled key-restoring spring. 851, the opposite end of which'i rests on thebott'omfofthehousing: f, One-wall of the `housing is cut away orslotted.. longitudinally;y as; at Y9i? (Fig. 2)., andxil-anged; arms'SI, 9fI projecting from the. slotted2 sidegoi-f. the housing;` engage and hold an insulated; conf- ,-11 GgIlQlliii gram isrshowmone, pole of; arsource 0f electrical energy; as the battery: 13 being connected to the: two electro-magnetsyl there illustrated',similarY conductors-leadingto the remaining f ourfof; the entire series of six electro -magnets;as;indieatedv tact-point supporting block 8 closely against the slotted side of the housing.

Each of these insulated supporting blocks is provided with from one to siX contact points 92 secured in any convenient manner in a vertical row registering with the slot or opening e@ in the housing 9. Fig. 2 illustrates that key housing having ve Contact points.

The contact point or points 92 are insulated from each other and each contact point is in circuit with its individualV electro-magnet i9.

A lead connects the key housing 9 with the other pole of the electrical source E, it being obvious that the several housings can be electrically connected so that a single lead only is required. The housings are insulated from the main frame of the machine in any convenient manner, not shown.

The key plunger lc, of insulating material, is provided with a diametrical bore 93 extending from that side of the non-cylindrical plunger' which lies in Contact with the slotted wall of the housing 9 tothe opposite side of the plunger.

Two contacts 94, 95, shown as globular in shape, are carried in this bore or aperture, between which contacts is placed a spring 9S to retain the contacts at the respective outer ends of the aperture. One of said contacts 94 engages the adjacent inner face of the housing, the other contact 95 being protruded from the aperture a sufficient distance by the spring 95 to extend through the slotted opening 99 in the housing and wipe over the insulated Contact point or points 92 mounted in the insulating supporting block 8 upon depression of the key.

It will be appreciated that the contacts 94, 95 and spring 96 carried by the key constitute a contact member travelling with the key to close and open a circuit or circuits individual to the respective electro-magnets I0.

It will be noted also that in those instances where the key, upon depression, closes more than one circuit, the circuits are closed successively and not simultaneously, thereby greatly reducing the strain on the anvil caused by the impactoi the upper ends of the embossing rods Ha thereagainst.

The operation oi' the embossing mechanism under control of the character keys 'i may be understood from the foregoing description.

It will be understood that the severalcharacter keys 1 and their housings are exactly similar, the only difference being in the number of stationary contact points 92 arranged for engagement by the respective keys, and hence the number of particular electro-magnets which are energized and the number and pattern of the code character impressed in the work sheet by the embossing rods Ila.

The provision of six individually operable embossing rods and their actuating electro-magnets having individual circuit connections permits of some forty-two permutations, thus enabling a like number of different code symbols to be embossed to represent the letters of the alphabet, the ten numeral digits and some of the punctuation marks. For example, depression of the character key l representing a might result in the formation of a small boss on the writing line of the sheet; depression of the character key representing b might result in the formation of two bosses in the sheet vertically arranged one directly above the other. Obviously, this would mean that the insulated supporting block B associated with the character key a carries av single contact point 92 only, whereas the supporting block associated with the character key b carries two contact points in circuit with two separate electro-magnets controlling the actuation of two embossing rods, one behind the other, as viewed in Figs. 1 and 2, and so on.

Pressure of the operators finger on a key top 1a depresses the corresponding plunger Ic in thel housing 9 and compresses the key-restoring spring 89. The plunger, during its descent in the housing, wipes its traveling contact 94, 95, 96 over the contact point or points 92 on the insulated supporting block 8 to close successively (assuming two or more Contact points are engaged) the individual circuits leading to the appropriate electro-magnets IU to effect succes sive energization thereof.

The electro-magnets thus enegized attract their armatures Illa, causing the actuating levers I i I to drive the associated embossing rods l la, lia upwardly against the record sheet and anvil, to form a code character corresponding to the notational character ofthe depressed key.

Assuming 'the selected key to be one co-acting with a plurality of vertically arranged contact points 92, the escape of the traveling contact 94, 95, 96 past the first contact point engaged, opens the circuit through the particular electromagnet appurtenant to such contact point, whereupon the corresponding embossing rod restoring spring becomes effective to lower its embossing rod lla to normal idle position and in so doing, rock the actuating lever Il back to its normal position to disengage the corresponding armature Illa, from the core of its electro-magnet, such action occurring as the traveling contact escapes past all the stationary contact points.

Removal of pressure on the depressed key 'l 1 enables the key restoring spring 89 to return the key and its traveling contact past all the contact points 92 until the traveling contact comes to rest above the uppermost contact point.V

Obviously, the identical embossing rods I la are thus again operated, though in reverse order, during the return of the depressed key, but since the letter-spacing mechanism (not shown) while tripped, is not permitted to operate until the traveling Contact escapes past the uppermost stationary contact point, the only result is to provide a more deeply incised impression of the code character in the work sheet.

Reference has been made to the provision of means enabling the operator to correctly position and align the work sheet, not only preliminary to commencing to Write thereon, but also when it is desired to reinsert a partially written sheet intorthe machine and start writing where the previously written matter stopped, and also when it is desired to write on both sides of a sheet.

In the last-named event, care must be taken to emboss the lines written on the back of the sheet at such places as will not confuse the tactile sensing of the written matter 4on both sides of the sheet, bearing in mind that the indentations on one side of the work or record sheet result in projections on the opposite side, and it is the projections arranged in code representations that are to be sensed.

Consideration will first be given to the means provided for correctly positioning the work sheet in the machine preliminary to writing thereon, and for arranging for the re-insertion of the sheet in case of its removal from the machine @Images prior to `completing"'theiwriting' thereof, -constitute another `feature of this invention.

-Af-ter thecoiled -ffworky "sheet -isinsertedend-- wise into the 'hollowcylindrical paper holderff, fits' leading edge -is drawn through the'ipaper throat 84 and. rearwardly valong l*the vf'paper apron 85.

The operator, having first rocked the' handle 88 to -lift thepressurerolls Hoff the'sheetfeedfing -rolls |16, continues-to Ldraw-the"leading'end 'of fthe --sheet rearwardly -through the fgap thus formed lbetween the sheet 'feeding-fand the pressure'rolls and -through the passage'between the 'lower recessed-face -of *thea-nviljand' the -upper end of the embossing -rod' turret 14.

It then `becomes 'necessary nto lcorrectly posi- 3tion the Vsheet Vin the 'machine Ain order'rthaft A'it vmay be `fed ina straight linere'arwardly'out'of fthefmachine, Ato whichfrend, there'i's provideda knovel V'means for squaring the leading" edgespf 'successive sheets inpositionand to"a'fforda"uni i'form :top Ior leading end margin.

`These' results-are effected `by the provision 'of 1)' pivotally intermediate their endsat 'S8 "to the "inner faces of "the Ypaperfcarria'ge' "end wframes. The forward arrnsof fthe 'pivote'd gage 'mer'rbers extend to `pointsiinmediate'ly beneath ecc/entries forpperation'wth' the pressure rolls. "The rear "arms of 'the' gagernemberssupport upwardly extending'registeri'ng or 'aligning pins "6, and ata suitable distan'ce'ini'fr'ont of each pin, these rear arms supportati upright i'nderiting vstylet lllf, 'the stylets being of 'slightly less "height than "the "gage pins""6.

Springs IDI conne'ctedtofthegage,pins normally /draw the respective gage members 9,1 `4c'lock'vs'lise relatively vto fthe position shown. inFig. 1,' when thepressure rll'cast-'off .handleis in its in'ifective position, and fthe pressure rol-1s |'I Aengaged with .the 'feedrlls' T6. I In suchmormal `clockwise Tpositions, the upper ends of .the vpins .6 ,and their 'stylets T88 lie .ina plane .beheath themath o'fftheiw'ork sheet '.to afford .no obstruction Atothe advance. of thesheet inlet- .ter spacing direction.

/ But when the .pressure roll 4.cast-off handle rocked to its effective `positi`on,.toraise .the 4pressure rolls .the .eccentrics onthe-pressure roll cast-off vshaftvvipeover thefrontarms ,of '.thegage supporting members to rock the .members .counter-clockwise `and l-position the aligning or gage `pins Bgacross the pathvof the leading edge of the sheet as it is=led `rearwardly preliminary to adjustment.

I At this time, `.the sheetisv but loosely heldin the machine vand the operator canmanuallyshift it .until the `opposite corners of the leading edge of the sheet contact the long gage pins 6 to square or correctly position the sheet in the machine. v

The counter-clockwise movement of .the gage frames 91 results in positioning the upper free ends of the stylets |08 `directlybeneath the sheet, and after the operator :hasf-a'djusted the-:sheet relatively to the.. gage pinsphevpresses'thesheet downwardly over the stylets to form indentations or punctures in the sheets at points just a short distance below the leading edge of the sheet.

Such indentations or punctures will result in forming projections on the upper facel of the sheet, which serve two purposes, as soon explained.

I0 vllr'fter 'the Ir,o1o"n1a1-gin of the ysheet has thus been indented or puncturd, the vcast-off `handle I88 fis restored to its -normal position, permitting fthe spring pressure roll armsll'a to cause'the -pressure rollsto grip'the work sheet, andas 'the eccentrics 89 release lthe forward -arms of the Ygage frame fig?, the springs lill rock 'the gage `--frames -with their-aligning -pins @and indenting fs'ty'lets -I- clockwise to withdraw the pins and stylets from the -path lof the sheet.

'Writingon 'the sheetmay vnow proceednt being clear vthat 1the punctures Yformed in the top =margin of the sheetby the stylets-are well beyo'ndftherst writing line of the sheet.

Y-It may become necessary, after having partially Acompleted `the writing of the sheet, `to 'remove the sheet' from the machine, and later, to replace! the sheet and complete the writing from the pointwhere the .sheet was removed.

"The'1provision'of the top margin punctures by fthe stylets jlfllilwgreatly facilitates this operation.

The'partiallyfwritten sheet is reinserted and aligned --with the gage pins 6 justas before `explained. This, however,-is not suicient as there `isno proof Eto -the operator that the sheet is in ithecriginal position laterally with respect to the working lines so that there will be no'diference vrin theside marginsof the rsheet. By'providing the'f-stylets 00, however, -Ywhich-v have beenele- -vated Lto their effectivepositions lwhen re-insert- 'ing the ipartially' l'written 'Sheet, lthe operator A'by his sense of touch can feel the punctures formed `in 'the top margin, andicanJ Ashift the sheet sidewise -will the -leadingedge is -still held against 4the 'gagepins-, until'ithe top margin .punctures register vwith the *upper "ends yof ithe stylets, Iafter `whichfthepressure roll Ycast-off handle may ktbe rocked torenabl'e the pressurerollsto vbecome `ef L'fective--and 'toperrnitthe 'springs l|`|l| 4to .rock the gage frames vto their vidle positions. Then by "advancing the' sheet'inline spacingdire'ction by the Atwirler 5, the last lpreviously written "line ris brought to the writing point, and the writing completed.

It may be 'desired-,to write onjb'oththe front and fback sides of.a sheet in which .event,.as above explained, it is necessary to so ,.posiiton the sheet when .itis .insertedfor writing onthe rear vface thereof, lthat .the .lines vof indented 'Braille code characters are interspersed, stagg'ered or "interpointe'd .relatively `to the =previously.writtenlineson the front ofthe sheet.

.The above-.mentioned .top Amargin punctures, .in combination .witnmeans nowto be described. are utilized iny positioning .the sheet-.to 4effectsuch interspersahof theelinesofewriting on the re- .spective 0pposite.-sides of a `single sheet.

. A- cross shaft :|02 extends between and; is `journaled ein ithe fendY framesfgof the travelingv A.carriage 2 :catiatpoininiabnve.'.theapatniof` the v;sheet, snohj cross shaft zsupportingga pair L' of indenting 'members f m3'. `arranged transversely of, fand fast 'fon tlieshaft=-with itheir #pointed ends pro"jecting 'forwardly' Ato positions overhanging lthe- -`upper ends I'of' thestylets fili) andl lo'catedjpreferably nearer the rst writing line than the punctures formed by the stylets.

When the operator desires to write on both sides of the sheet, when positioning the sheet in the first instance, as above explained, he will not only puncture the sheet by means of the stylets |00, but will also manually rock the nger piece to cause the indenting members |03 to puncture the top margin at points half a line space nearer the first writing line.

Thereafter, the operator will proceed as heretofore explained until the front side of the sheet has been written, whereupon he will reverse the sheet side-for-side and re-insert it in the machine in the manner explained. At this time, however, instead of registering the stylet-formed punctures on the stylets and abutting the leading edge of the sheet against the gage pins 6, he will slide the leading edge of the sheet upwardly over the gage pins until he can register the punctures formed by the indenting members |03 with the stylets, which not only squares the sheet and properly positions it relatively to the side margins, but also enables the first written line on the back of the sheet to be located half a line space beneath the rst written line on the front of the sheet.

The pressure rolls, when returned to their effective positions, retain the sheet in its newly adjusted position and permit the gage frames and stylets to disappearf that is, return to ineffective position.

Attention is directed to the fact that the punctures formed by the stylets and those formed by the indenting members are opposed to each other as regards the projecting portions thereof, and lie at different distances from the leading edge, which difference is readily sensed by the operator who can thus assure himself as to which side of the sheet is front or back.

The paper apron 85 is apertured to permit the gage pins 6 and stylets |00 to shift upwardly to be controlled by the sheet.

I claim:

1. In an embossing machine of the typewriter class, the combination with'a main frame; a paper carriage mounted to travel thereon; grouped embossing members mounted in the main frame; an anvil superposed above the grouped embossing members to afford a passage therebetween for the work sheet; and pressure feed roll mechanism mounted in and traveling with the carriage to support and advance the work sheet; of a normally idle leading edge gage mounted in the paper carriage to shift into and out of the path of the leading edge of the work sheet at a point beyond the grouped embossing members, to provide a top margin of suitable depth; an indenting member located between the leading edge gage and the grouped embossing members, said indenting member being shiftable with the leading edge gage into and out of effective position; and means to cast off the pressure roll mechanism and incident thereto, to shift the leading edge gage and the indenting member into operative relation with the work sheet, to arrest the leading edge of the work sheet after it has passed beyond the indenting member, and thus enable the operator by slight pressure on the work sheet, to form an indentation therein, which irr-w dentation, upon the replacement of the work sheet in the machine, may be registered with the indenting member to facilitate the relocation of the work sheet in the position to which it was originally adjusted. A

2. In an embossing machine of the typewriter class, the combination with a main frame; a paper carriage mounted to travel thereon; grouped embossing members mounted in the main frame; an anvil superposed in line with the grouped embossing members and spaced apart therefrom to afford a passage therebetween for the work sheet; and pressure feed roll mechanisms mounted on and traveling with the carriage to support the work sheet and advance it in line spacing direction; of a leading edge gage shiftable into and out of the path of the work sheet at a point in line spacing direction beyond the grouped embossing members; a normally idle indenting member also shiitable into and out of effective position relatively to the leading edge of the work sheet to enable the operator to indent the work sheet on one side thereof; a second normally idle indenting member shiftab to indent the opposite side of the work sheet at a predetermined distance in line-space direction from the point at which the first-named indenting member is effective, to enable the operator to replace the sheet face downward in the machine, and by registering the second-named indentation with the first-named indenting member, to position the sheet so that the embossed lines on the back of the sheet will be interspersed or interponted relatively to the embossed lines on the face of the work sheet, and means to operate said second named indenting member.

3. In an embossing machine of the typewriter class, the combination with an embossing mechanism; and a pressure feed roll mechanism to support a work sheet and feed it in line spacing direction past the embossing mechanism; of a leading edge gage shiftable into and out of the path of the leading edge of the work sheet to determine the depth of the top margin; a pair of indenting members arranged on the respective opposite sides of the work sheet to form indentations on the respective opposite sides of the sheet, said indentations being formed a predetermined distance apart substantially equal to half a line space, to enable the operator to reverse the work sheet face down for reinsertion in the machine, with the indentation formed by one of said indenting members in register with the other of the indenting members, whereby the embossed lines on the two sides of the sheet will be relatively interspersed or interpointed; and means to shift the indenting members into and out of their respective effective positions.

JUAN DE LA FUENTE TEJEDO.

REFERENCES CITED FOREIGN PATENTS Country Date France Nov. 1'7, 1923 Number 

